Not sure why the glowing reviews as after ~ $40 for the basic exterior/interior + tip we found they weren't detailed oriented enough (sand from camping trip still in passenger footwells, random bug/mud splatters missed on side doors from hasty washing/wiping).
That said, I've definitely had worse and it's possible that you get a lot more when you get a couple steps up in service but we weren't ready to invest $200 on a shampoo without seeing the quality...and now don't plan to.