Cat has cancer and is shitting everywhere

My cat is about 6. He has lymphoma affecting his colon and small intestine. He is taking chemo meds and steroids and eating an all-duck diet. This does not seem to be helping. He sometimes makes it to the litter box, but sometimes doesn't make it all the way there, sometimes seems caught of guard, and sometimes doesn't really seem to try to get to the litter box. He's also been peeing in various spots, something he never did before getting sick. I clean every day and use anti-icky poo enzyme cleaner. The house still smells terrible and it bums me out. It's also kinda expensive constantly doing laundry at my apt to wash/dry is $5 a load and it is kinda expensive to constantly be buying enzyme cleaner, carpet cleaner, clorox wipes, etc. Just wondering if there is anything I can do to make the situation suck less. Thank you 💗