I have just serviced my washer system, only this weekend
The tank comes off dead easy ( 4 x 10ml bolts underneath ).
Don't undo the filler neck unless you have too as that is a bit of a pain to get back in place ( tho not that hard really )
Might be wise to get some spare tubing as it often goes hard and brittle.
I got mine from B&Q, the next size up from the smallest they stock.
Also go to an aquarium shop and get some of those lil plastic tube joiners to hook up to the existing tube that goes to the jets.