I have dbl clean on the van , but i only use it in worst case scenario type jobs, also i use fib + fab rinse on most of my jobs can`t go wrong with it.
will have to grab some ultrpac then, if it helps on draught marks seeing some really really bad ones recently and it`s a right mare getting at them with a brush to scrub it out.
One job i did last year in a big georgian house in Cambridge had big wide stairs with about an inch of black where there was a gap in the middle took ages to remove....