Atsko Silicone Water Guard is the stuff to use.
Don't confuse silicone sprays and silicone sprays...(most are lubricants...)

With outdoor gear it is always safer to use soap NOT detergent.
The stuff you use to wash down, also sold by your supermarket as "pure soap flakes" maybe in liquid form too.
Remember the "pure soap" (that is :no detergent) bit.