I actually just use the Gaggia decalcifier that I bought from Daily Cuppa Coffee. I've heard about vinegar and sodium bicarbonate but I really just think I'll stick to what I know because it's what's worked for me really well so far. It doesn't really hurt my budget either so that certainly...
There are more ads than art on your blog.. I can see you wanna earn some money from it.. but trust me unless you provide value no one is gonna come back on your blog.. First think about the users and then I am sure the users will make you earn from it.. Cheers!!