Every workbench ends up with one aerosol can that gets reached for more than any other, and for a lot of mechanics that can is MO-94. Muc-Off built this multi-purpose spray to handle the odd jobs that fall between your dedicated chain lube and your degreaser: freeing a seized bolt, chasing moisture out of a component after a wet ride, quieting a squeak, or leaving a light protective film on bare metal between washes. This is the 750ml aerosol, the workshop size, which is what you want if you find yourself reaching for the can several times a week rather than once a month.

The formula penetrates quickly, displaces water, and lays down a thin lubricating film that keeps rust and corrosion at bay. It provides light lubrication for moving parts, reduces metal-to-metal contact, and helps prevent dirt from sticking to the surfaces you treat. That combination is why it earns the "toolbox in a can" reputation. It is worth knowing that current production is PTFE-free and the formula is biodegradable, so it treads lighter on the environment than older penetrant sprays. A few retailer listings still reference the older PTFE version, but the spray shipping today has moved away from it.

One thing to keep in mind before you start spraying: keep MO-94 off your tire treads and braking surfaces. A penetrating lubricant is exactly what you do not want on a rotor or a rim brake track, so mask those areas or aim carefully. Beyond that caution, it is genuinely as versatile as the marketing suggests. It is not fussy about what it is used on, which is why plenty of people keep a can in the garage for household jobs like a stiff lock, a squeaky hinge, or a bolt that will not budge, alongside the bike duties.... Read More