Bid help needed on concrete wall

I was contacted to clean a concrete wall for a HOA and was wondering what you guys charge for something like this. Do you have a set amount per linear foot? 6ft tall wall and several thousand feet long. I really only need to clean the upper half as they have shrubs from end to end.

Pictures would be helpful. Will you be using SH, using a wall surface cleaner?

I didn’t take any pictures. Yes, we will be using SH. It’s a painted concrete wall, presumably to help keep traffic noise to a minimum for the residents on the other side. We are planning on using a 6ft wand and regular tip to clean. Nothing more than just light algae that needs to be removed.

W/O pics we can’t give you much advice.

What’s a “regular tip”? Watch out for dcbrock and his surface wall cleaners, some are hazardous.

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