There is not 'oven cleaner' smell to this product and it is in a squeezable tube. It is not too runny, but I would suggest being prepared with waterproof gloves and kitchen roll (for any accidents). It does say not to put on aluminium (back of my oven has an ali plate) or on self clean sides. (not got those on my oven).
I brought it as wanted a cleaned recommended by Bosch, to avoid any issues later. I am very happy with this. It does not cause too much of a mess, but as I wanted to use the oven that evening I could only apply for 2 hours. The results were better than ok but not outstanding. However I am sure if I had used overnight judging by my 2 hour results the effect would be brilliant. I had to do a little bit of scrubbing, due to only 2 hours application, but not excessive and I now have a beautifully cleaned oven.
Definitely need gloves and a bowl of soapy water ready for removal, but this is the same as what would be needed for any oven cleaner.
I will buy again