Alum block stretching

I was watching a YouTube video the other day about stretching techniques and he recommened rubbing your stretch fingers on the alum block to get some traction. I tried it and, wow, great results. I was, for the first time, able to get a great ATG on my chin.

Just thought I'd pass along for any who are having trouble with stretching. Anybody else use this?

No, But do not get the alum on your blade,you get instant patina.

That's a favoured trick around here, and undoubtedly it works :)

Sounds like a great tip, but I've been afraid to try it. With my luck, I'd get alum all over my brush, razor and hands.