Q&A for How to Clean a Fountain Pen

It is better to keep pointing the cap upwards so it will prevent the excess ink from flowing inside the cap.

That depends on the brand and model. For example, with an Lamy (Safari or AL-star), you can pull out the nib and push a new one in without removing the feed. With most Pelikan pens, you can screw out the nib and feel and screw in another one. With some pens it's very difficult to replace the nib yourself.

White vinegar is a well-known for its cleaning agent properties. It may be used to clean mineral deposits in coffee makers, for example. As such, it'll help to clean a fountain pen also. The cheap stuff is fine.

Any with 5% acetic acid content. Obviously avoid balsamic or other vinegar with added stuff. Just plain distilled vinegar.