Throw used soft plastics in a bag you keep with you - then buy a bottle of : "Mend It" soft plastic glue and repair them while watching your favorite fishing shows on TV   ... If a soft plastic is beyond repair try to find someone who can reheat and pour into molds for making new soft plastics or worse case throw away in a trash can (never in the water - why do you think "deadsticking" catches bass ?)

I like how my used baits mold to my  boats cup holder until I take them out and recycle. I melt all my used plastics over the winter a pour stick baits out of a mold I made from  plaster of Paris and senko said. I just mix dark with dark and light with light. I come up with some very interesting colors. Also grind salt and add. It gives me somthing to do over the winter and my kids love throwing stick baits.  I do however sometime run with  scissors, color outside the lines and pull all the girls hair that I like. (Don't tell my wife)

leave them in the boat and clean it out when the trip is over