Using Penetrating Oil 

Rusted bolts and nuts, such as those found on automotive alloys, become stuck over time and can be difficult to remove, especially when there is rust present. It’s recommended that you use a penetrating oil or lubricant, to remove rusted bolts and nuts. Purchase a spray penetrating oil product and spray to loosen bolts.The main reasons for using penetrating oil are, of course, rust removal and lubrication. The oil penetrates the rusted component first, softening it and allowing it to be freed.

Using a Torch 

The next option is to use a heat torch to remove the deep rust from the nuts and bolts. This heating will expand corroded bolts and nuts, allowing them to be readily loosened. Please be careful when heating the nuts and bolts because there is a risk of flame if there is already a lot of lubrication on them.

A wrench can usually be used to remove a bolt by unscrewing the nut from the bolt. However, if the bolt is rusty or otherwise held in place, you’ll have to find another means to remove it. If the hexagonal surfaces of the bolt and nut haven’t been removed, loosen the bolt by spraying penetrating oil or burning it with a heat torch.