Double washing.

10int = 1mp extra for every class except mages.

144 int = 14 extra mp, or 3.5 hp resets per level.

edit - if a point in MP only gives you 2~4 mp, there is no point in double washing. you need to get more MP out of an AP point than the reset will take out. for ranged, double washing works because we get ~14mp per point in mp, and AP resets take out 12. if you only get 4, it won't work at all.

Thanks for your answer but you are getting my point wrong.

I think i should have started by explaining how i think you do 2x washing.

1st you level up using INT gears. Here you get the usual MP for leveling (warriors get 4-6 MP) + INT/10.

2nd you put all 5 APs into MP WHILE YOU ARE STILL USING THE INT GEARS. And it's here where i need help. Warriors get 2-4 MP per AP placed in MP + the misterious extra bonus that i'm looking for.

I can give an example of how this works for NLs:

A NL gets 14-16 MP when they lvl up + INT/10, and they get 10-12 MP for every AP placed in MP. But some NLs reported that if you place the APs into MP while still using the INT gears, they get more than 10-12 MP. The number someone said was 20 MP while having a total of 150 INT. So if you take that in consideration, you are getting 8-10 more MP per AP used simply by putting them while still using the INT gears. And that's where the magic 15 INT = 1MP appears. But like i said i need confirmation before spending all that Nx.

Back to how 2x washing works.

3rd point would be reseting the 5 points you put into MP and place them into HP.
4th would be reseting 5 points from MP and place then in the main stat.

Now it would work like this for a NL (notice i will use 150 INT gears for the example, and the lowest possible gain from lvling and APs used):

1st- Lvl up --> you get 14 MP (from the lvl itself) + 15 MP (from the 150 INT) = 29 MP from lvling
2nd- Place 5 APs into MP --> you get 20 MP (10 from placing an AP into MP and "another 10 for the INT gears") * 5 APs = 100 MP from APs

Total MP gained after a lvl = 129

3rd- Reset 5 APs from MP to HP --> you lose 5 * 12 = 60 MP and you get 80 HP (since when you are placing an AP from MP to HP you get the least HP possible which in NLs case is 16).

4th- Reset 5 APs from MP to LUK --> you lose 5 * 12 = 60 MP and you get 5 LUK.

So in the end you end up getting +80 HP, +9 MP (129-120) and 5 LUK while using 10 APs.

Now i need someone to confirm this for a warrior.

Thanks.