It seems like when my bike is dirty, it immediately climbs up on guests or furniture...seriously, I think something like a velosock is a good idea. If you just want to keep the spots on the wall clean where the tires touch, consider some clear film such as Sure Swatch (we got it at Home Depot in paint department)...these are 9x12" low tack, adhesive backed clear film, usually used to try paint colors on walls. I've had a piece (painted blue) on my den wall for over a month and it is holding up fine...you can move them a few times before the adhesive expires. No mess on wall. Lol, if you like this idea, come help paint my den!