Metal rubbing sound/Chain cleaner

[nicki.v]

My bike has a metal on metal kind of sound from the front tire area when I'm driving occasionally. It doesn't always happen and it can happen at various speeds. When braking there is more of a sound so I'm not sure if the brake needs to be adjusted?

It just rolled over 1000km so my husband and I will be doing the servicing soon. How do I clean and lubricate the chain? I've never owned a bike before now and neither has my husband.