You forgot THE most famous fabric protectant: 3M`s Scotchguard. That aerosol spray can was(is?) available over-the-counter and the "pro-version" used by many new-car dealers back in the day as a dealer-installed add-on (AKA, Additional Dealer Option Fee).
Value wise, i think 303`s Fabric Guard would be a good choice. Yes, it is designed for outdoor fabrics, but if ultimate repellancy is desired, this is the product to use.
See the Autopia Store`s
303 Fabric Guard - 32 oz.
and read the reviews.
I clean with Optimum`s Carpet and Fabric Cleaner-&-Protectant. The supposedly built-in fabric protectants remain after cleaning without any additional application. Personally, I am not big fan of fabric protectants, BUT for someone else, like a client who has young people or little ones that may eat and drink inside vehicles with fabric seats (think family vans or SUVs taking them to whatever sports practice or game and eating fast foods on-the-go), fabric protectants are a necessity (to them anyway).
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