QUESTION:
We have a 7-year-old toilet that has begun showing a light blue color. When I try to scrub the blue stain with a toilet brush it doesn’t come off. We’ve never used those blue tank canisters; we just use liquid bowl cleaner. Do you know why the toilet bowl is stained light blue? I checked the water (in the bowl and the tank) and it is not blue.
I also noticed a lot of black mold inside the toilet tank when I took the lid off. Is it a good idea to use bleach to clean the mold off the inside of the tank and underneath the lid? There is a rubber-type 5-inch ball in the tank. Can I use bleach to clean that rubber since it too has mold on it?
ANSWER:
The light blue stain is a strange one. Do you have a private well? If the water is slightly corrosive, I suppose you could get a blue stain from copper or brass in touch with the water. Perhaps it is from a cleaning chemical? I would try to clean the bowl with an acid-based cleaner. Look for the acid cleaner in a plumbing supply or hardware store.
You certainly can clean the toilet tank with any chemicals you wish. Most toilet tanks will have deposits. If you do use bleach, don’t let it sit on the rubber parts because it can damage the rubber. You can remove mold with just detergent and water.

Other options would be a wipe-on
If you want quicker action, try scrubbing with a strong solution of 

A rusty colored, black stain is from rusting metal on the antenna or the fasteners. This type of stain will lighten with time as the weather and sun bleaches out the color. You could try a rust removal chemical like
To remove the smoke smell, you need to remove the soot. This involves washing or cleaning any cloth materials. The hard surfaces should be cleaned with a dry sponge. A dry sponge is specifically used to remove soot from hard surfaces. You will find a dry sponge at big-box stores and professional cleaning suppliers. A dry sponge is like a big soft eraser that is wiped on the surface to absorb the soot.
I suggest you clean the plastic laminate with a strong detergent grease cleaner. Any strong kitchen or household cleaner will work. Then rub the cabinets down with