Do I just use clean water and a sponge or does someone know a better way 
Also whats the best way of cleaning my HG cruise jacket? Washing machine?

Also whats the best way of cleaning my HG cruise jacket? Washing machine?
) Finish off with a nikwax wash to reproof it and your done. As for the leathers, wipe off mud 'n' flies with damp cloth and then I use one of those silicon shoe shine pads to feed and polish them in 2 minutes flat.