Harriet is on a mission to clean up the streets where she lives.
Here she explains how she's doing it.
"I'm fed up with the state of the pavements in the centre of Hereford which are being blighted by ugly chewing gum carelessly thrown down by people.
On the streets in High Town the situation is really bad.
People don't care
I reckon there are thousands of bits of chewing gum spat out by people who don't seem to care about the area.
A lot of it's stuck hard to the ground but sometimes it is still sticky and sticks to your shoes making a right mess... especially if it gets onto carpets.