Have you tried C,L,R, /C for Calcium, L for Lime, R for Rust, Works well for this
About $6.50 w/tax for 28oz. bottle at about any hardware store an some grocery stores.
Good Luck. an wear gloves Tim R.
If it's beyond pressure washing, then boost with an abrasive cleanser or one formulated for rust like CLR or Lysol Lime & Rust Remover Toilet Bowl cleaner, comes in a black squirt bottle.
Lemon juice is one of the best to use for any household problem related to cleaning. Sprinkle a little lemon juice over the rust cylinder stain and after 10 minutes, use the toothbrush to brush it down. You will slowly start to see the rust cylinder stain on the floor tile disappearing.
The acid which is present in a tomato is the best to remove the rust cylinder stain from the floor tiles. Rub a fresh piece of tomato directly onto the stain, add a little rock salt and brush it in a circular motion with the toothbrush.
Toothpaste Yes, toothpaste works too. Smear a little paste directly over the rust cylinder stain and using the brush, rub it up in a circular motion. When done, wash the tiles with a little water and soap.
Vinegar is another remedy to remove rust cylinder stains from the floor tiles is with the help of vinegar. The acid present in the vinegar will help to thin and lighten the stain, thus making it easier for you to wipe it down with a clean, soft cloth.