Wohida asked: How do I restore stainless steel hob following the use of cillit bang, which has left blotchy stains? I cleaned the hob with cillit bang, however, I left it on for too long. Now, it has left horrible, blotchy marks.. This has also ruined granite worktops as well. Please, can you advise?
Cillit Bang is a cleaning product made from a combination of sulfamic and phosphoric acids. Although it is safe for many cleaning applications, it should never be used on acid sensitive materials, including some metals and granite.
If you have stainless steel that has been damaged by acid, it’s almost impossible to repair it. You may have some success immediately after the acid spills by rinsing the object, then buffing the affected area with baking soda and a non-abrasive cloth. Another option is rubbing in hydrogen peroxide. However, this too must be done as soon as the object comes in contact with the acid.
Several site users have reported having success at removing the Cillit Bang stains from their stainless sink by using the automotive product, T-Cut, and some elbow grease.
Similarly, granite worktops or countertops won’t recover from acid damage without being refinished. Depending on the amount of damage, you will probably need to call in a professional for restoration. For light damage, a commercially available granite polish may improve the appearance of the granite. To use, follow the directions on the label of the product you choose.