I've just started using Pre-MIX in my 13B-MSP. Smoother feel almost immediate after the 1st fill-up. I'm putting in bout 200ml (believe it's a US quart) for every 50 litre tank.
Like lennon said RM 60 for a 1 litre bottle to last 5 fill-ups.
I bought this B&D KP600 ROB some time ago. It was one of my first step into amateur detailing. B&D ROB is very common and available at many departmental stores and hardware shops. This machine makes a great tool for...