Warcraft Levelling Exploits Part 2, 20-60 (Patreon)

From level 20 onwards it is generally adviseable to milk the receding but still impressive xp gains from using Method Zero (see https://www.patreon.com/posts/9594015 ) at Ragefire Chasm (Horde) and the Deadmines/Stockades (Alliance). 

Scarlet Halls, minimum level 21 is a viable option but I generally bypass it and go straight for the Scarlet Monastery (minimum level 23). The dungeon is quite small and can be cleared in a couple of minutes at most with a demon hunter even without Skystep Potions or Bear Tartare. The one difficulty is that the boss Brother Korloff has to be killed before the end bosses can be reached....however that only results in a minor xp loss. 

For players who prefer to quest in-world rather than use Method Zero in dungeons there's a very powerful exploit which works from 20 up to level 60, which I uploaded last year and still works: https://www.youtube.com/watch?v=QT2uNNW-6F0&spfreload=10. This glitch gives you two quest pets (Johnny Awesome and Apothecary Lydon) which will kill more or less anything quickly. 

You can add to these with a farmer army using this trick: https://www.youtube.com/watch?v=l92rh1AGATY&spfreload=10. 

Generally speaking dungeons are faster than questing even with these super-powered pet exploits but there are occassional situations when you find very dense groups of mobs and/or use quest helper add-ons where this may not be true.

For those who persist with Method Zero, at level 37 you can enter Stratholme.  Scarlet Monastery xp will start to decline by this stage so it is a good idea to run some Looking For Dungeon groups with quests between 32-35.  Stratholme is a good candidate for Method Zero that can be run repeatedly.

Around 42-45 Stratholme starts to become less efficient, so que for lfd again, prioritizing dungeons with quests you've yet to run  again. Btw It may be better to just doing Method Zero is lfd que times are long.

47-58 Should be no surprise to experienced readers as this exploit has gone mainstream. Blackrock Depths: Detention Block can be completed very quick by killing only two bosses right next to each other. Enter the dungeon through lfd, click on the mole machine and choose "Just past the grim guzzler".  Jump down from the ledge and kill Lord Incendius and Fineous Darkvire (you may need to explain this strategy to your group) and re-que. Hopefully you will join a group already doing this. 

As soon as you hit 58 got to Outland and do Ramparts using Method Zero till you hit 60.