I use the Pets to go and the Smog and Go when I need to. Smog and Go want the actual coupon to staple with the paperwork. Pets to go I just mention I have the coupon “Somewhere” and they give me the discount.
I don’t use the car wash one’s. I only recently started using car wages (the past 2 years, to save water) and I find the one’s that advertise in there are still expensive.