1. I've only over-oiled my machine a couple of times, and it only made a mess in the bobbin area, which is covered. I've never gotten oil on anything I've sewn.
2. The kind of oil you use for machines doesn't seem to stain fabric.
3. My husband has greatly honed my laundering skills by dumping something greasy on a nice dress shirt a couple of times a month. This is the best grease spot remover I have ever found. I buy it from Hancock Fabrics.
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