This is one of those things I tell people I will try, but make no promises. The brick will be OK. Hot water and degreaser will help, a lot.

On the vinyl, you will spend a lot of time. If the pressure washer is not working initially, just start scraping right away. It's probably what you'll have to do in the long run anyway. Plastic paint scrapers work good. I usually just tell people I can't get these off siding without picking each individual one and price accordingly, just like artillery fungus.

Also, they seem to come off better when they have been on there dead and dried out for a year or two. If the customer is patient and reasonable, pressure wash of what you can and come back next year.