Old radiators can accumulate a lot of dust inside or cat hair, bits of paper, and other odd things. And these accumulations can be difficult to clean out because of all the narrow crevices in the radiators. But the job can be done with a radiator brush (available in hardware stores), a smaller bottle brush (available at Target or the supermarket) and a vacuum cleaner. The brushes are usually constructed of bristles on a wire stem. The wire can be bent to get into the crevices. You can use the brushes to loosen the debris and the vacuum cleaner, left on nearby where you’re working, sucks it up.