I’ve looked at several tutorials to remove the noise in the following audio clip, however, I can’t seem to get rid of the noise (you can hear it mostly towards the end of the clip).
Can someone please help remove the noise?
https://soundcloud.com/user259497537/jingle
Thank you. 
Use Audacity 2.1.0 from http://web.audacityteam.org/download/windows and try Effect > Noise Reduction… . Have a read of http://manual.audacityteam.org/o/man/noise_reduction.html to learn how to use the effect.
You will need to select the noise before the jingle starts and use that noise as the noise profile for Noise Reduction. The clip you posted cannot be properly noise removed because there is no noise before the jingle to use as the profile.
If you do not have any noise before the jingle starts then a rough job can be done as per the attached by selecting as little of the end of the jingle as you can for the profile.
Gale
Your clip sounds great, but when I play it as a ringtone on my phone, it still sounds unclean and rough. Is there a special technique used when making phone ringtones?
Audacity Manual.
Gale
The original clip you posted has the typical hiss noise from too loud microphone you should be able to get rid of it with the equalizer just find the frequency of the hiss and turn that down on the equalizer then when you export it you wont hear the hiss. 