Coca Cola is a great degreaser.... excellent for removing oil spots from you driveway
Strangely Pepsi max does not work anywhere near as well, neither does Cheap shops own cola
Pepsi max has no sugar, this may make a difference. Esp if the Cheap cola is diet.
Re HP, do not use it on bronze, or maybe only some bronze.
Not sure which bronze, but the regiment had a Crimean era small cannon in the Mess. They tried to clean it with brown sauce, and the cannon turned black. It would not clean off. The cannon was as good as destroyed when it was cleaned with an angle grinder. Typical of what happens when a Lt. Col. demands, 'I don't care how you do it, DO IT'.