Bests & Worsts Reviews from Amazon

I took a swab of this and a swab of a controlled 70% solution I had before in my house. I swiped each on the same surface and at the same time. The 70% swab I had prior evaporated way before this supposed 70% version that I was sold did. This makes me wonder if this is a watered down version and not truly 70%. If you are trying to fight Covid-19, I wonder if this is nearly strong enough. I have no other way of testing it, but it certainly does not behave like the 70% controlled version I had did.