Once 4-in-1 Moss, Algae & Lichen Remover – One of Ireland’s Most Powerful Moss Cleaners
Powerful, Long-Lasting Protection Against Moss & Algae
Once 4-in-1 is specially designed to eliminate Moss, Algae, Fungi, Lichen, and Red Discolouration from a variety of surfaces, ensuring they stay cleaner for longer. With its bleach-free and acid-free formula, Once is highly effective at tackling even the toughest growths. It delivers visible results in just 90 minutes, becomes rainproof within 180 minutes, and provides up to 12 months of protection, making it one of the most powerful moss removers available in Ireland.
Where to Use Once 4-in-1
Ideal for removing stubborn moss and algae, Once can be used on:
✔️ Concrete – Driveways, kerbs, and footpaths
✔️ Patios & Decking – Keeps surfaces clean and slip-free
✔️ Headstones – Restores stone surfaces without damage
✔️ Greenhouse Glass & Pottery – Prevents green staining from algae
✔️ Timber & PVC – Perfect for fences, sheds, and garden furniture
✔️ Tile & Slate Roofs – Removes unsightly growths and protects against regrowth
✔️ Tarmacadam & Walls – Ensures a fresh and well-maintained appearance
✔️ Boats & Fibreglass – Keeps marine surfaces clean from algae buildup
How to Use Once 4-in-1
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Mix:
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For normal cleaning, mix 1 part Once with 5 parts water (covers 210 sq metres).
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For light use, mix 1 part Once with 10 parts water (covers 385 sq metres).
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Apply: Use a watering can or garden sprayer on a dry surface, ensuring thorough coverage.
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Wait: Moss and algae will begin to disappear within 90 minutes.
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Remove: Once moss turns brown, use a yard brush or light hose to clear the area.
Why Choose Once 4-in-1?
✅ One of Ireland’s Most Powerful Moss Cleaners
✅ Long-lasting – Up to 12 Months Protection
✅ Quick Results – See the Difference in 90 Minutes
✅ Rainproof in 180 Minutes – Works Even in Irish Weather
✅ Bleach-Free & Acid-Free Formula
Keep your outdoor surfaces clean, safe, and moss-free all year round with Once 4-in-1!
Download SDS SHEET
ONCE 4 IN 1 Action expert hardware
WEEE Recycling Producer Registration Number:12889
How do I return my old product to be recycled?
You can return your old product to MyDIY. Waste Electrical and Electronic Equipment (WEEE) is taken back free of charge on a one-for-one, like-for-like basis. Waste batteries including rechargeable batteries are taken back free of charge. You are not obliged to make any purchase when returning old batteries. Each local authority must also accept household WEEE and small batteries free of charge at its recycling facilities. All WEEE and waste batteries must be recycled and should not be placed in any of your household wheelie bins. Make sure you always recycle all your old electrical goods and batteries.
What products can I recycle for free?
You can return anything that is electricaly powered or battery powered. Even your old bicycle lamps can be recycled!.
Do you take back used batteries?
Yes we do. The batteries that we accept are AA, AAA, C or D, powertool batterys and also the flat batteries that are found in watches and toys. Unfortunately we do not accept back any Industrial or car batteries.
Do I need to have made a purchase at MyDIY.ie?
No you don't. You can recycle any of the above items at our store in Inchicore Dublin 8, even if you have not made a purchase with us.
Will you collect my old product?
Yes, but we must be notafied within 14 days of purchase date. You can still arrange to have your old appliance recycled free of charge. Simply bring it back to our Inchicore store and we will ensure that it is disposed of in an environmentally friendly manner.
How much will it cost?
There is no charge to return products to any of our warehouses.
Why should I recycle with MyDIY?
We will ensure that your old product is disposed of correctly to reduce the potentially harmful effects caused on the environment and to conserve natural resources. Further information can be found on weeeireland.ie.
EMC (Environmental Management Cost) Included in the purchase price.
Gas discharge lamps, LFLs and CFLs €0.15
LED lamps and luminaires €0.05
Large appliances €5.00
Delivery Information
Fast & Reliable Shipping with DPD
We ship all orders via DPD, one of Ireland’s most trusted couriers. With DPD’s one-hour delivery window, you won’t have to wait around all day for your MyDIY.ie order!
Delivery Times
Each product on our website is marked with an estimated delivery time. If you order multiple items, your order will arrive based on the item with the longest delivery time. For example, if you buy two next-day items and one 3-day item, the entire order will arrive in 3 days.
While most products arrive in 1-2 days, we offer over 44,000 items, so please allow 4-5 working days for some deliveries. Need it faster? Call us at 01-446692, and we'll do our best to help.
Delivery Charges
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FREE delivery for orders over €99 within Ireland.
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Orders under €99: €8.99 delivery fee.
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International delivery: Charges based on weight—contact us for a quote.
When Will I Receive My Order?
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Most orders ship on a 24-hour courier service (2 working days).
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Larger orders may take 4-5 days, and pallet deliveries require scheduling.
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Orders placed before 2 PM usually ship within 24 hours.
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Orders after 1:30 PM Friday or on weekends ship the following week.
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Busy holiday periods may cause slight delays beyond our control.
Do I Need to Be Home for Delivery?
Yes, someone must sign for deliveries due to item value. If you're not home, DPD will leave a card with re-delivery or collection instructions. After two failed attempts, your order may be returned to us, and a re-delivery fee may apply.
Damaged or Incomplete Orders
We carefully pack all orders, but if something arrives damaged or incomplete, contact us within 24 hours. Report shortages within 3 days of delivery.
International Shipping
We ship to Europe and worldwide, with charges based on weight. Liquid products cannot be shipped internationally due to regulations. Contact us for a quote—we're happy to help!
