Yeah, Deet will melt the plastic lines. It will also damage clothing, waders, boots, etc.
Funny we put it on our bodies.
Alot of folks across the pond swear by baby oil and Detol 50/50... Iceland, NZ, Au, etc if it works there, why not here.
From Natural pest control
Anyways, I've used old Military surplus deet... Used to melt our clothes, I'm deet free now.
Cheers,