i empty the oven before letting it cool, while its still hot, i use a toothpick to clean out the oven( i find it better than the included keychain tool, and the toothpick is disposable
And after the oven is empty i use the brush to take out the remaining bits.
i load the oven again and have another session, after 4-5 sessions i do a deep clean, i clean the oven with iso.
So far i have been using an alcohol that i bought from pharmacy, no one could tell for sure the percentage of alcohol.
Now i bought an isopropyl rated at 99.6 or sth and i was worried it could melt the rubber gasket behind the oven. it would be a disaster