1. Begin cleaning the mattress.
2. Don't fuck up.
3. Finish cleaning the mattress.

>>1014903
You need to take it to a car wash

>>1014903
Dip it in a swimming pool. The chlorine and bromine will get rid of all the nasties.

>>1014903
Use a crane

Depending on the level and type of grot. Take outside in the sun, stand vertically.
Apply cleaner :
Spray bleach if nasty
Degreaser if smelly
Pool acid if urine
Leave for 2-5 mins. Brush with a broom, leave another 2-5.

Hose from top to bottom, ensure all chemical and grot is hosed away. Dont use a pressure washer or the material will go to shit.

Leave in sun to dry. Cover at night - will take 2 or so days to dry properly

Label three pigs "1" "2" and "4" and let them loose.

>>1014953
Came here to post this, or something like it.

>>1014903
You pretty much can't. Try spot cleaning. Next time use a mattress protector.