I brought my car in with mud on the inside and outside from a few days of camping. I normally wash my car myself but my car was dirty enough that I thought spending $20 would be well worth it -- I was disappointed to leave with spots of mud in multiple places on inside and outside, and dust and leaves still on the carpets. Once I got home I had to spot clean the multiple places that were missed for about 20 minutes anyways, so next time I'll just skip the professional wash.