Fifth attack's safespot is a bit to the left from the middle at the bottom of the screen.
Which only lasts for a certain period of time :V
I'm also finding it interesting that the OP didn't start off by giving suggestions / examples / etc.
First and foremost, I'm a person who generally detests anybody using safespots unless it's for scoring. Just getting that out of my way.
Right, so in this post, I will cover UFO Stage 3. There are quite a number of safespots / blindzones that can be used, most with regard to Graze (or scoring if you will) however some have nifty applications when going for a "vanilla 1cc".
To begin, we have the start of the stage, with the fairy that shoots a load of bullets at you, all aimed at a single position. For best results in terms of grazing, simply circle around like so:
You could just simply tap-dodge but that's no fun at all.
Next, we have Mid-Boss!Ichirin, whose lasers can apparently be a bit troublesome for some players. Here's a little pointer. It's a little messy, but it shows how the lasers are fired. This can be applied to all difficulties. Watch your vertical position (co-ordinate) though. With regard to scoring, Normal should be supergrazed from the top-right "between" the green and red / blue laser spawn points. Hard should be done as shown. I'm not too sure about Easy and Lunatic, as there appears to be changes here and there so I'll omit that for now.
Then, we have the Spell Card, which can be shotgunned at the start. How close can you get? Well, you can probably use an indicator like this (note: yukarin's replay):
...but I generally just use my own judgment.
Then! We have the large fairies, which
have no collision box. This means they can be safespotted for a fair amount of graze. For best effect, grazing the initial should be done a little bit more to the
left, and for survival, you should be shooting at all times and a little bit to the
right. Because the right one drops a Red UFO.
A similar approach can be taken with the end of Stage fairies as well, however bear in mind the risk from aimed bullets, and ramming into the wall of bullets fired.
This then brings us to Boss!Ichirin. We all know about supergrazing the first Non-Spell, however for those who don't the spot is located
approximately on the left lock of hair present on the sprite. Always the left. The lasers can also be grazed afterward however watch for collision with the bullets you just grazed or the laser spawn points or even Ichirin herself when doing this.
We then move on to... Ichirin's second Non-Spell. This can be done as far as I know, on all difficulties not named Lunatic. You start off on the
right side and a bit below the center of Ichirin; the edge of the dress makes a somewhat good marker, and you graze in a L-shaped pattern like so:
It's also interesting to note that every even iteration (on Hard at least) has the aqua / teal bullets not "extending" as far as their odd counterparts. You can see here that I went a bit too far and lost some potential Graze which I could have gotten by circling around the inside of the wave.
Lastly, Unzan's eye in the last Spell Card. This one is appears to be tricky, but in reality it isn't. The best way to approach this is to move up. Moving
into the eye horizontally (i.e. left or right, depending on which eye you go for) is risky business. There's also a bit of wriggle room inside the given spot.
Note that for optimal Graze,
luck is needed as the lasers fired are random.
And that's it. I think.
