just tried out my second hand aridex for the first time and i used prochems fibre shampoo in it which i am told needs to be flushed out properly or it will leave a residue in the machine. anyway i emptied the shampoo solution out of the tank and filled with clean cold water , i then turned on the brush to foam and run the machine for about a minute until it stopped making foam but i am not convinced i have cleaned out the brush pipes properly so any advice on both using and cleaning out the machine would be appreciated.