Some folks here are being a bit abrasive.

Or, in the alternative, some guy on Youtube used 400 grit sandpaper to clean his all nice and shiny, but I'm wondering if the abrasion would short the coil?

As a true outsider with no dog in the fight, I have to say: David, if Renatus is all you claim it to be, you are truly doing it a disservice with your abrasive responses.  

My husband did some googling and has decided that he wants to buy an abrasive blaster and soda blast the basement.

Mickey it sounds like you and I are at the same stage--I have 3 rentals right now and am looking for a fourth.My concern was wasting money, since I had to go through a couple of different lawyers first before finding one who is knowledgeable in business law, doesn't have an abrasive personality, etc..

Yes, that abrasive practitioner of "tough love", your comments are surely missed.For that matter, what about Tim.

I like to start with the least caustic chemicals and the least abrasive scrubbers first then work my way up.

The durability of the finish layer is rated by Abrasion Class (AC).  

I don't think he would be receiving many commendations from people and it seemed like a better approach than being abrasive. 

They're about $150.They will love you long time.Every toilet everywhere looks like that after a number of years.It can be cleaned by chipping away at the scale and using a good abrasive but the abrasive may also remove the enamel.