Ralfus,
When on active duty we used a scrub brush or tooth brush and tooth paste to clean webgear. However, on old webgear this may not be a good idea as it may cause excessive wear.
I think putting in a old pillow case and washing on a gentle cycle with some sort of mild soap may be the answer.
How are the Garands doing? The 40X still shoots great. Had it out to play a week ago.
AJ