well its never happened to me till now

We bought a car at auction, couldn't believe the price (Lincoln Continental),.. and found out why, it too had had a deceased person in it.. We rolled up windows, put hotplate with saucepan full of ammonia in it.. boiled it till we thought it was done, pulled the plug, let it sit for a coupla days, then opened it up to air out for a few days,, "fumigated" it,, smell was nearly gone, smelled okay for a ford... sorta worked for us...