They are very good although I still prefer a good old fashoned Bright Boy Pad sometimes. I have 3,one is the delux Monsoon (flood car) fill the tank with cleaning fluid of choice,set the needle valve so it slowly drains out and run the car around. Wet cleaning is not too bad,then I have two of the dry cleaning cars with Craex Rollers one also has a small magnet for picking up stray small metal items off the rails. This is the car I would recommend.I say this even as the owner of an expensive Tomix (now Atlas) cleaner,rail grinder,suc-o-lux vaccum car which I do not use very much. besides John of Aztec is a very nice guy. Nate Goodman (Nato). Salt Lake, Utah.