I didn't have good luck with Squirt, and I have reason to believe ZFC when they say it's actually not that great unless you can work it into the chain, which takes a very long time. My experience was with a new chain that I thought I cleaned thoroughly with OMS and denatured alcohol, but with Squirt the chain gunked up after every ride and was noisy within 50 km despite repeated application (nearly the entire bottle). I have a lot less fuss using NFS, but now I'm trying Silca's new wet lube because I also have no confidence that a wax-based lube works for me without a pristine new chain.