Dealing with Dirty, Sticking or Jamming Locks: If a lock has already got dirt inside and is starting to get sticky to operate with the key, it is a good idea to flush it out soon, before the problem gets worse. GT85 or WD40 are good for this.

If it has already got beyond that and is jamming, squirting in a lot of GT85 or WD40 and inserting and removing the key many times (e.g. 30+ times) and trying (gently) to operate the key repeatedly will invariably free it up.

It really can take a lot of flushing and key movements to clear grit etc from inside the cylinder, but it does eventually work virtually every time.

The Squire Stronghold locks are precision engineered items and dirt is the enemy so it is much better to keep them clean to avoid problems like this, or if they start to show signs to clean them out as described sooner rather than later. If you use WD40 for this process, you should follow it with something with better lubricant properties as WD40 has almost no lubricating ability. We recommend products like a dry (Teflon) bicycle chain lube.