Renaissance Luthier Co. Conservator Archival Finish Cleaner

An archival-grade finish cleaner for guitars, basses, mandolins, ukuleles, and other instruments finished in cured lacquer, polyurethane, polyester, acrylic, or shellac. It is water-based, with no wax, no silicone, and no solvent carriers. It lifts skin oil and grime and leaves nothing behind.

Use it on: cured nitrocellulose lacquer, polyurethane, polyester, acrylic, and shellac.

Do not use it on: violin varnish, ivory keytops, raw or unfinished wood, bare fretboards, heavily crazed or checked finishes (common on vintage nitro, where moisture can wick into the cracks and cause white blushing), or any finish that is already lifting or flaking.

What it does not add

Most instrument cleaners work by adding something. A little wax, a little silicone, something that fills the microscratches and throws back a shine. It looks good on the drive home. Then it builds, and it keeps building, and in twenty years a luthier has to strip all of it off before touching the finish underneath. Silicone in particular contaminates a surface in a way that causes fisheye in any new finish that goes over it, and it migrates into wood, cloth, and benches. It is the reason a lot of shops ban it outright.

Conservator was built backwards from that.

How it works

It is about 98 percent water, and that is on purpose. Water cannot dissolve a cured instrument finish. Suspended in that water is a small amount of decyl glucoside, a plant-derived surfactant made from coconut fatty alcohol, which surrounds skin oil and grime and lifts it off so it wipes away on the cloth. That is the entire mechanism. No abrasive, no solvent, no film.

What is left behind is nothing. The finish looks better because it is clean, not because something is sitting on top of it.

Conservator is made for regular maintenance between setups. It is deliberately gentle, so heavy, baked-on buildup may take a few passes or a visit to your luthier.

Why not violin varnish

Because violin varnish is not one material. It might be 18th century Italian oil varnish, spirit varnish, or a modern factory finish, and those three behave nothing alike. Oil and spirit varnishes are softer, more porous, and often crazed, and the pigment frequently sits in the varnish rather than under it. On a surface like that, even a mild water-based cleaner calls for caution rather than assumption.

Directions

Test on a hidden area first. Apply a few drops to a soft, lint-free cloth, never directly to the instrument. Wipe, then buff dry. On shellac and French polish, buff dry immediately.

Ingredients

Purified water, decyl glucoside (plant-derived surfactant), benzyl alcohol (preservative), dehydroacetic acid (preservative).

Four ingredients, fully disclosed. No fragrance, no dye, no wax, no silicone, no solvent carrier.

How it is made

Designed and made in small batches in Laguna Beach, California, by a luthier with a background in chemistry. Every batch is recorded, pH tested, checked for clarity, and held for stability before any of it ships. Every bottle carries its batch number.

4 fl oz (118 mL) in amber glass. Store at room temperature.