I don't know if this is the best way, but I have an original Polyglass tire (my spare), from 1971. I never used Armorall on it or any other tire cleaner...
I simply put a light coat of Petroleum gelly (vaseline) on it every 2-3 years, and it still holds air, I haven't added air to it in probably 5-6 years and holding at 28psi.
That baby is full of fresh '70's air, less polluted, but possibly herb scented,lol.
On the car, I have 2 Good Year Eagle ST's on the front, they date back at least 15 years or more. They are slowly starting to vent or crack, along the rim diameter. I think this is due to using Armorall, and then sit in the sun.
And taking the wheels off is a good piece of advice.
All the best!
Giles