My new RAC 1650w pressure washer. Works great but not enough power Jim!

I only bought this this morning after my Challenge Xtreme pressure washer hose broke. Argos gave me a full refund and so I went for this RAC number, rock n roll! It works brilliantly but it just aint powerful enough to clean the screen of emulsion. It's going back too and I'll upgrade for the RAC 2000w, happy days.