Ok, so its been over a week and I think I need to get my clean on.  on the 5 carts ive used I already replaced the stock filler with blue foam.  I am going to use 70% Isopropyl alcohol to sterilize the carts but what about the foam?  Am I ok to use the alcohol on the foam or should I just rinse with water.  How do you guys clean your carts and/or filler?