| Joined: | Tue Apr 17th, 2012 |
| Location: | Netherlands |
| Posts: | 196 |
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Continuing on your april-fools hint:
Anything a human being may excrete (by any means) may be harmful to somebody or something else (grin).
On the other hand: missing a good picture opportunity by not cleaning a lens may do more harm to your ego.
Regards, Gilbert