You may find that you don't need to get rid of belongings; you simply need to find adequate ways and places to store them.
Garages have more wall space than floor space, so look for wall solutions. Utility cabinets provide great storage and are durable enough to withstand the wear and tear of a garage setting. They are ideal for storing paint cans, spray bottles, buckets, gardening supplies, oil and gas cans, car supplies and more. Inside utility cabinets you can micro-organize as well. Use plastic bins to store smaller items and label them so that you can locate items when needed. Plastic storage containers are durable and highly adaptable for whatever purpose you need them. They're also stackable and can have airtight lids so that things stay dry and dust-free for years.
The ceiling can also be made into a convenient storage area. If you have exposed rafters, purchase a sheet of plywood that fits the dimensions of the space and create a loft area to store camping gear, Christmas decorations and other items you need to keep but are too bulky or used too infrequently to store anywhere else.
Hanging items from hooks is another good way to eliminate clutter. Shop your local True Value Hardware store for a variety of hooks and hangers. Simply secure them to wall studs or ceiling rafters. You can hang items such as luggage, gardening tools, ladders, bicycles, toys, etc. Hooks are easier to install if you first drill a hole that's slightly smaller than the hook's screw. When adding hooks to concrete walls, drill holes, insert plastic wall anchors then screw in the hooks.
Installing shelves or cabinets on the walls of the garage are also excellent ways to keep items out of the way but within easy reach when needed.
When using a drill always wear protective eyewear.