I have a very large very strong magnet. There are probably 5 or 6, 5 gallon buckets of nails. My magnets pick up a lot of nails but it is actually much easier to rake the nail to one side with a garden rake and just leave the nails laying there. I don't mind a few nails in my garden. I have shoveled up the wood ash with a flat shovel the bad part is when I dump the ash in the bucket it blows ash straight up in the air about 6 feet and chokes me to death. I get ash in my eyes, nose, hair, mouth, etc. I have experemented I can pour the ash in the bucket slow but a tiny breeze glows a lot of the ash out into the air and on the ground too. I tried a shop vac it clogged up the filter in 45 seconds. A broom works pretty good to sweep the ash in the buckets but I can only get 1/4 bucket of ash. If I try to pour ash from 1 bucket to the next I get an ash bath it blows up in my face. Ash is too light weight hard to deal with. If I move the ash very slow its not too bad but it takes a long time to scoop up 10 5 gallon buckets of ash like that. I still get charcoal and nail in the buckets but I don't mind that in my garden.