and2818875 wrote an answer about Nikwax Softshell Proof Wash In on May 10, 2009
Yes, the bottle says that you can use either:
a) a whole bottle with three items of clothing in a top loading washing machine
b) a third of a bottle with two items in a front-loading machine
c) a sixth of a bottle with one item in a bowl/sink of hand-hot water.
My choice is (c) - I only own a soft-shell, and using the bottle six times sounds the most economical to me.
Hope that helps.