A hand trowel lasts longer when soil is removed before it dries hard around the blade and handle. A short cleaning routine also reveals rust, a loose grip, or a bent blade before the tool is used in compacted ground.
Remove dry soil first
Tap the blade against a soft block or brush it with a stiff brush while wearing gloves. Avoid striking the edge against concrete because it can chip the metal. Clear soil from the handle joint and any hanging hole.
Wash only as needed
For sticky residue, rinse the blade briefly and scrub it with mild soap. Keep water away from unfinished wood handles and dry the tool immediately. Do not leave a wet trowel in a bucket where rust can begin unseen.
Inspect the condition
Check for a loose handle, cracked grip, sharp burrs, and deep corrosion. Smooth a minor rough spot only with a safe method suited to the tool, and replace a blade that is bent or cracked rather than forcing it straight.
Store it dry
Apply a light protective film to clean metal if the manufacturer permits it. Hang the trowel or place it on a dry rack with the blade supported. A quick brush after each use prevents the heavy buildup that makes later cleaning harder.