Or, use Robert Morein's advice, below - seems like good practice to me...;-)

"Isopropyl is good. Pros follow with distilled water, since iso does leave a

slight residue.

[...]

Wash your hands in hot water. Make sure you get all the soap off.

Take a piece of lens tissue, roll it into a cylinder, and tear it in half.

Twist one half tightly [make sure the tissue has no included silicone].

Douse it very liberally in isopropyl. The tissue is now so soggy it is

almost impossible to apply firm pressure, which is the idea. Don't hold it

near the end.

Hold your camera UPSIDE DOWN, so that the lens points down.

Using as much isopropyl as you want, try to dislodge and float the dirt off

the lens.

Isopropyl dries very quickly, but keep the lens pointed down until it does.

Otherwise, it may infiltrate to the inside of the lens. The edges are not

waterproof.

The isopropyl your should use is 91%. Do not substitute 71%.

Some fog on the lens may be due to impurities of the isopropyl, but most is

due to dissolved dirt that got moved around and dried in place. Repeat the

procedure using a new piece of lens tissue as many times as required."

-- Robert Morein

David Ruether

d_ruether@hotmail.com

http://www.David-Ruether-Photography.com