BUY another "backup skin" on clothing stores to hold on your house. When you got police stars, you can go to your house to change your actual clothes (skin) and loose your wanted level ...to the others players and map, so you can go to hide and wait to be clean, but if you meet a cop on this remaining time, your wanted level will be restored.
*When you are with your other skin, you will be advised that you must hide from police or your wanted level will be exposed.
(Sorry for my english)