Before you start work, put on hand gloves since you will be working with sharp pruning tools and might incur cuts. You can also put on safety goggles to protect your eyes from any flying particles.
Use a bristled hard brush to brush away all the dust, soil and deposit from your pruning tools This will remove any solid large particles deposited over them and clean off the major lot before you continue.
Take a bucket. Pour in a gallon of water and mix in a detergent or liquid soap wash of good quality. Make a soapy solution. Dip a clean rag into this solution and use it to clean the surface of all the pruning tools that you have. Pay special attention to the parts which come into contact with vegetation and clean them well. It is better if you use an antibacterial detergent which will remove any bacteria build up caused by vegetation. You can also use bleach to disinfect the pruning tools. Now rinse the tools with clean water thoroughly to get rid of the soap and remaining particles.
Take a clean dry towel and dry each tool separately so that there is no risk of rust due to moisture build up. Place the tools in a sun for a little while to dry them off completely. Now spray over an oil like WD 40 or any vegetable oil on the metal parts of the pruning tool. The oil will act as lubricant for the tool and help keep it in optimum performance. It will also prevent any rust or corrosion.