Speaking for myself, I would chuck the smelly rug, lol and start new!!I have an entrance rug from costco (actually 3)that I use in our laundry room garage entrance. It is large (3x5) with a rubber backing. I've seen the same type of mat at HD & Lowes. I have had my washer leak onto and it has endured years of muddy, wet and snowy boots and shoes, not to mention my dog. I even spilt a gallon of milk onto it and hosed it off and it has never been worse for the wear. Very similar to the waterhog mat but less $$.
Here is a link that might be useful: Floor mat
Q