To throw the whole sofa away? How to clean??

[Readyforbedbysix]

Sorry, I know my title was dramatic.
18 months ago I got a pale grey fabric corner sofa (dfs angelic if anyone wants to look up).
It was clean for about 5 days then just got wrecked. It is not machine washable however I have to wash the covers every few weeks. I have 2 children under 3.
Aside from putting a throw on it, how can I keep it clean? The covers do come out clean but the washer is wearing them down a bit, a zip has split on one of the covers and it’s starting to go a bit bobbly. And there’s slime on one of the covers (coincidently the corner bit that I can’t flip over) which won’t come out in the wash. AND the hard bits like the arm etc have got water marks/chocolate finger marks etc.
What products/techniques would you use? Inbetween machine washing I occasionally use washing detergent and water and just scrub with a cloth and that does remove some dirt but not all

Would hand sanitiser shift the slime? My ds got slime putty in his onesie (as you do) and this worked a treat!

Also get some low lighting (lamps, fairy lights) for the evenings so you can relax and not notice the stains. That’s what I do. (Also am short sighted.)

I don’t think you are meant to wash the covers.

Hire (or buy if you can afford it) a Rug Doctor.