Put a sock on your bike and keep your floor dirt free.

One of the problems with storing your bike indoors is that the wheels are usually dirty. This can be a problem if you have to take the bike inside frequently, since you can’t wash the bike everyday. The solution is to get the Velo Sock Bicycle Indoor Storage Cover, which prevents sand, mud, and other debris from being brought into your room and walls by dirty bicycle tires. It is made from polyester and spandex, and comes in a compact storage bag.

Buy on www.amazon.com
$25 - $75