cleaning some matted fur? water bath? help??

my chinnie boy has quite a bit of fur on his underside (tummy, back legs) matted with urine. i'm looking for help in cleaning it.



i've tried dust baths upon dust baths and it's only helped a little. i think i need to give him a water bath... and I"m really worried about how to do this. anyone else ever needed to give a water bath? I'm worried about getting him dry enough!



please help!