Hello, I have put together some balsa bridges and want to make them look 20 years old approx. I know there is a product available that artificially ages balsa wood, but there must also be some kind of household product freely available that does the same thing. Maybe some kind of acid ? Does anyone have any experience ? I have previously stained and rubbed down for an old look, but is there a quicker way to achieve that bleached worn white-greyish look ?