A simple way to clean corrosion from a twist drill bit is to let your power drill help you. While applying oil to the bit at its point of entry, drill repeatedly into a block of hardwood secured in a vise. Friction of the bit against the wood and abrasion of the wood chips will provide a scouring action to clean up the bit in a hurry.
Radon testing device(s) should be placed in the lowest level of the home suitable for occupancy. This means testing in the lowest level (such as a basement), which a buyer could use for living space without renovations. The test should be conducted in a room to be used regularly (like a family room, living room, playroom, den or bedroom); do not test in a kitchen, bathroom, laundry room or hallway. Usually, the buyer decides where to locate the radon test, based on their expected use of the home. A buyer and seller should explicitly discuss and agree on the test location to avoid any misunderstanding. Their decision should be clearly communicated to the person performing the test.