I have one of those washers. It works really well, but is flimsy and leaks. Not a long term solution.

What works best for me is to start with a clean body and take off my cycling clothes as soon as I can. Just getting wet from sweat isn't that big of an issue. The clothes dry and don't really have a chance to grow bacteria (that's the purpose of being clean yourself before riding).

But, if I spend significant time on the bike, like 2 or 3 hours, those clothes just need to be washed. Wearing "bacterially enhanced" clothes on a regular basis is asking for skin problems.