I've had many squibs from all brands, except my reloads, as I visually inspect each primer seated and charged case that runs through the progressive press. They're a fact of life, like guns and magazines that break. I've had 45 auto squibs that cycle the action but won't completely close on the new round, because, thankfully, the squib bullet hadn't completely left the chamber. A cleaning rod down the muzzle tapped it back out. It is considered bad form to use the frame as the hammer.
Solvent and oil in the chamber and on the bolt face shouldn't kill or weaken a primer. That would make a click instead of a bang. Cleaning the chamber and bolt face are more important for rifle shooters with high pressure cartridges. Most good pistols are designed to work under the most unfavorable conditions. The BUG is for when they don't.