options:
find a valeter and pay them to do it professionally for you
go to B&Q and rent a rugdoctor carpet cleaning machine and buy the chemicals there
you shouldn't have to remove the soundproofing material... but if it is waterlogged and knackered replace it or make sure it is thoroughly dry before you put it back in
wrt the smell you if it continues you should be able to remove the odour with an aromatek treatment