[Iain macdonald]

got area to clean in a back garden that realy need use hypo on but the run off water is going run onto artificial grass  will it damage it

[Mike Halliday]

I've done 4 jobs with artificial grass and hypo has not done any damage.....  but don't take this as a definitive answer.

I would apply neat hypo to an off cut or small inconspicuous area before I start cleaning and leave it, when I've finished powerwashing I would check it, if there's no damage I  would continue

[Smurf]

Reminds me of a render softwash job I did. I rolled up the artificial grass away from the wall of the house  just to be on the safe side. lol

[Smurf]

I've done 4 jobs with artificial grass and hypo has not done any damage.....  but don't take this as a definitive answer.

I would apply neat hypo to an off cut or small inconspicuous area before I start cleaning and leave it, when I've finished powerwashing I would check it, if there's no damage I  would continue

Also you should be able to get hold a different types of artificial grass free samples from your local supplier to have a play with.