The kitchen is a good place to start removing clutter, because it is an easy place to start.
First, get everything off the counters. Everything. Even the toaster. Put the toaster in a cabinet and take it out when you use it. Find a place where you can store everything in cabinets and drawers. Of course, you may notice that you do not have cabinet space to put everything. Clean them out. The dishes, pots and pans that rarely get used? Put them in a box and put that box in storage.
You see, homebuyers will open all your cabinets and drawers, especially in the kitchen. They want to be sure there is enough room for their "stuff." If your kitchen cabinets, pantries, and drawers look jammed full, it sends a negative message to the buyer and does not promote an image of plentiful storage space. The best way to do that is to have as much "empty space" as possible.
For that reason, if you have a "junk drawer," get rid of the junk. If you have a rarely used crock pot, put it in storage. Do this with every cabinet and drawer. Create open space.
If you have a large amount of foodstuffs crammed into the shelves or pantry, begin using them - especially canned goods. Canned goods are heavy and you don't want to be lugging them to a new house, anyway - or paying a mover to do so. Let what you have on the shelves determine your menus and use up as much as you can.
Beneath the sink is very critical, too. Make sure the area beneath the sink is as empty as possible, removing all extra cleaning supplies.