What contaminated the tank? If it is heavy metal ionic contamination (dissolved metal), then plating out is your only hope. If it is organic contamination (eg metal particles and dirt or too much brightener), then filtering is the only option.
Caswell sells a carbon filter kit for filtering out organic contamination. You might try setting up this filter with your tank and just running it overnight. In the morning, throw out the filter insert and carbon filter, replace it, and run it for another 12 hours. By the time you've cycled the tank through a few times, you will probably be as clean as this approach is going to give you.
A 35 gallon tank is fairly large. You might want to alternatively consider an outboard fish tank filter. Buy plenty of activated charcoal and filter insert material. Good luck.
Ken
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