many years ago a pint of milk fell over in my van and emptied itself all over the passenger footwell carpet. I poured pints of soapy water in and out of the van in an attempt to flush the milk out. I thought I had succeeded as no pong at all (was dipping below freezing at night and cold during the day).
Then came the 4 day Easter weekend, it was a scorcher, with the van sitting in the sun all buttoned up.
Tuesday morning I opened the door sat in the seat and almost didn’t get out, my god the smell……. Another morning of flushing with buckets of warm water got the smell to acceptable levels, till the next morning and repeat for a week.