I have been using a product for over 40 years on rubber parts. It is specifically designed to maintain the life of rubber and is used in most all tire shops. It's just called "Rubber Lube" I have been getting mine at any NAPA Store. Comes in a gallon can and you just put some in a spray bottle. Works great on dressing up your tires too. Just like 303, spray it on and wipe is off. I think you will find it's much cheaper too.
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