It depends upon what you want to clean off! Over-zealous cleaning that destroys the patina can seriously can destroy the value of an item. There are many books written on the subject of caring for antique furniture. I suggest that you invest in one of those or take the item or an expert restorer who will undertake to do the task appropriately. Over the years, I have seen hundreds of pieces that have been ruined by so called "re-finishing". This forum isn't really the place for on-line tuition in antiques restoration.
There may well be such a web-site though I do not know of it. But, a Google search might get you the information that you want.
Vinegar.
You can clean an antique copper faucet. However, you may not want to. If you clean the piece it could lose its patina which takes away from its value. If you do clean it, use soap and water and be gentle.
If you are going to purchase a best quality oak furniture at affordable prices then I would recommended you to go for kernow furniture. They stock a large selection of 16th, 17th, 18th, 19th and 20th Century solid and veneered oak furniture in a variety of vintage, retro, antique and arts and crafts styles.
You did not state what the sculpture was made from. This would determine how you clean it.
Using products that are specifically for oak furniture is the best way to clean it. If you use something else, it could ruin the oak and no one wants that.
The address of the Middlecreek Valley Antique Association is: 104 Oak Ln, Middleburg, PA 17842-8274
Oak sideboards are available from fine furniture stores, from antique stores and from charity stores which specialize in larger items, usually from deceased estates. Other places to look in would be auction houses and farm clearances where antique furniture is disposed of.
Websites that have antique bracelets for sale are Zales, Oak Gem, Lang Antiques and Ruby Lane. Other websites that offer this type of accessory are Georgian Jewelry and Antique Jewelry Mall.
There are many stores in Portland that could do this. For example, Classic Woods Antique Restoration in Portland would be able to refurbish an oak desk.
There are several methods available to clean antique crystal decanters. Avoid putting them in the dishwasher, instead, use a mixture of 1 cup vinegar to 1 quart warm water to safely clean the decanters.
One can buy an oak desk from office supply stores such as Staples, antique stores, secondhand stores, Amish or Mennonite communities, or furniture stores.
Antique lockets are delicate and require special cleaning techniques and procedures. A person can clean an antique locket safely and effectively by using a mixture of baking soda and water. A person can use a sponge dipped in the baking soda and water solution to softly rub the antique locket then let it air dry.