I've got in the habit of clearing only enough camps to recall, upgrade my item, and buy another pot and a ward. you need about 500 gold for this. then after that the clear gets so much easier. I think actually this way, you clear more camps faster with the second item then if you waited as long as possible before recalling. you can also afford to gank sooner with more champs if you rush the first upgrade of machete, since sustain is much better with that upgrade, especially if you upgrade to blasting smite.
paths I might use are, 2 golems -> red -> wraiths -> crab -> recall or the same thing but wolves instead of crabs. with full runes I usually only need to consume 1 pot with most champions, some need both and some can clear without any pots. the first few times I'm more likely to mess up, but once I get a sense of what champions can do this path, if I feel "too low" for a camp I eat a pot and do crab before finishing red side. I'm pretty sure I've found that if I clear three of the smaller camps and only 1 buff, by the time I recall and clear the next camp and buff, I can gank, do crab, or another camp is re-spawned nearby and I can keep farming.
I also remember one time, I actually just skipped the buff entirely, when I was on smurf about level 18 or something. or trying out like ashe in a bot game xD and it actually helped. especially the red buff, it does a lot of damage.
gromp also does a lot of damage, earlier in the season I'd do like wolves and wraiths and a buff, skipping gromp with some champs.
when doing wraiths, you want to try to clear the small wraiths first, they do the most of the damage in that camp. with the wolves, occasionally I do the small wolves first, it tends to be "slower" this way since you might have gromp buff or AOE abilities, but its damage this way is more manageable. I think this is also true of the blue sentinel.
also be aware of your champion's passives. for example, with vi, on first clear I do crab in the middle instead of at the end, I forget the exact path, so that her passive can be up for the next camp. I think it's if I start gromp, i do crab before blue. or something like that. with maokai, I use my q three times while waiting for 1:55, so that during the first camp i use two abilities and heal up with the passive. (four times and your passive proc's too soon and some of the heal is wasted) and also make sure to consume his passive before using an ability if it's up. stuff like that.
some champions, like warwick or amumu, I make sure to level up one ability twice before getting the third ability at all. amumu is e->w->e->q, warwick is q->w->q->e.
I'm not sure who needs what masteries and runes, but a lot of people prefer to take runes and masteries focused on low-level damage output. for example, with amumu I actually take 21/9/0, and in the right tree I take 2 points in CDR 1 point in the 1 point level one mastereis, then level 2 is 3 points in AD and 3 points in AP actually! and of course the 4th point in each at level 3 masteries. that AD damage helps low level wave clear so much, and tanks "win late game" theoretically with item builds, so taking the early damage for better jungle clear is essential.
, 
, 
,etc), but I have a lot of issues doing the first clear, especially on 
.
. He clears for very little mana because his E doesn't cost anything, and his passive restores a large amount of health and mana whenever you kill something.
and use your smites on Gromp and red buff.
