Our slate patio has become very slippery. How do I clean the slate?

I pour buckets of hot water with some ammonia in it, and use a stiff brush to loosen up any moss, and then rinse off with the hose.

scrub it good

remove moss

try biological washing powder

Here is a no scrub product:

http://landing.wetandforget.com/easily-remove-moss-from/?gclid=CjwKEAjwvr3KBRD_i_Lz6cihrDASJADUkGCadXNl6xeiEvfdhIo_EzTxW_6DUDTo-of9fOkslZS03xoC46jw_wcB

We used dawn dish soap. Just add a quarter cup of dawn to 1 gallon of water. Mix well, then use a push broom to clean, & rice with water. It cleaned our slate very well & it stopped it from being slippery. It will also remove any moss.

Wash it with vinegar and a stiff brush and hose off. Get help if you can't see it yourself.

Try this site:

www.hgtv.com

www.hgtv.com/remodel/outdoors/washing-your-patio

Power washer