I wash walls ALL THE TIME. My mom NEVER did. Me and the husband had to totally rehab her house when she left, to help repay what she contributed to implants. The woman had never washed a wall in her life, I don't think, AND when she purchased it, (she selected the options, it was new built) they had NON WASHABLE PAINT IN THE GARAGE. (?????????)
We went through SO many quarts of simple green, and ended up doing a LOT of painting, but me and the husband know how to rehab a house to brand new. It's not crazy HARD, it's just a LOT of work. The real estate agent saw it before and after, and apparently (according to the husband, I hate that lady for a bunch of reasons and can't be around her without issues) she thought it added like $30K in value. It would have been a lot easier with some ROUTINE maintenance. Anyway, she wanted to hire my husband to do some work around the house, only upon later discussion with him, it turns out she spent a lot of time talking about her "absent husband" and "handy-man jobs" she needed, so I had to inform my husband she was *hitting on him* which only made me more annoyed.....
But, after that large digression, I scrub parts of my walls almost weekly, usually high traffic areas like around door handles and whatnot.
More people should do it, it's actually kind of soothing, not OCD. Nice paint looks nice. So, I scrub dirt where I find it on the paint I have now LOL.
It also stops situations such as the above^^^^^^ my mom had regular cleaning ladies, but when all her stuff was removed???? Terrifying. The worst part was vacuuming and fixing her silk drapes without totally killing them. For me, anyway. I think the worst part was the husband finding out he got hit on, LOL, he kept saying, "Oh my God, what if I said yes?" I pointed out that a hasty exit is always an option, but he seemed all a-tremble.
Anna