Cleaning the Entrance to My House/Entryway

Usually in English if you are talking about a house entrance you call it an 'entryway' or the 'entrance to the house' :)

This morning, I cleaned my entrancthe entryway/entrance to the house.

I guess this is because the entrance is not well- ventilated and often gets moisture by dewecause of condensation from the metal door.

Don't think well ventilated needs a '-', 'by' can mean 'because of' but the second is less formal, and dew/condensation are the same so only needs one :)

I have to clean up where it easily gets moldy regularly from now on.

I'd try 'I have to clean up where it gets moldy regularly from now on' having easily sounds wordy :)

There were leaves and sand bBecause I hadven't cleaned there forin a long time, there were leaves and sand.

"There were leaves and sand because I haven't cleaned there in a long time." is also correct but less natural sounding.

Worst of all,The worst part was that there was black mold on the corner of the wallpaper.

"Worst of all, there was black mold on the corner of the wallpaper." is correct too.

I guess this is because the entrance is non't well-ventilated and often gets moisture by dew condensation from the metal door.

I removed the mold usingwith mold killer.

I haveFrom now on, I need to clean up wthere easily area that gets moldy regularly from now oneasily on a regular basis.