This will depend on the circumstances. We are always willing to try and help out where we can, so a simple phone call to say you may be 10 minutes late is all we ask.
This will depend on what type of chemical was previously in the tank. Generally a wash will take between 15 minutes to 30 minutes.
With every wash we offer a cleaning certificate stating that it has been cleaned properly and has no residue left in the tank / manifold.