Clockwork Alpha
Skeletron Prime
While I was just farming pirates, it came to me: A super quick and efficient way to purify your world.
First, you need to be in a hardmode world to do this. Beating your first mechanical boss will allow you to get a steampunker to move in. This is 3x easier with Plantera dead. Then you need to buy the clentaminator. No doubt is it expensive. Well, here's where we start using the money making method. Put lava pits at both ends of your base, and make the lava shallow enough where you can still get hurt, but the drops won't. Test it before you use it. Secure your base so you don't die.
Next, we need to get pirate maps. Head over to the ocean, and constantly farm until you have 5 or more, as each solo invasion gets you around 30-40 gold coins. When you have enough, spawn the invasions at night when your npcs are most likely safe, depending on how your base is set up. Now, you just need a bit of patience. Start summon one invasion after another. Your only enemy to deal with will be parrots, which are very weak. Do this until you have 2 platinum coins. Now buy the clentaminator from the steampunker. Now, go farm more pirate invasions. Use your coins to buy as much green solution as you can afford. It's expensive, but using 1 or more platinum coins can take you a long way. Pirate invasions can also get you items like discount cards and gold coins, which can significantly help you buy more solution for less.
Corruption/Crimson/Hallowed grass can spread over 5 block gaps, and other spreadable blocks can spread over 3 block gaps. Keep this in mind when you do the next step: Creating barriers against the crimson/corruption/hallow as you continue to purify your world. For example, purify a large area then create a barrier or extend your base's barrier to slow down or stop it's spreading. First, I recommend spraying the surface. This will keep the surface from threatening you, and the only place where it's possible to come back is from missed blocks or the hardmode strip that spawned. Now if you don't consider it cheating, you can use TEdit to locate any missed blocks. After you have the surface taken care of, use TEdit to find the spots of crimson/corruption/hallow that formed from smashing altars. Locate and destroy these so they don't become a problem later. Now for the hardest part. If you are real serious about stopping the spread, it's time to clentaminate the hardmode strips. Not easy at all, so don't be expecting it to be too fun, even if it's worth it not having crimson/corruption/hallow all the way down your hellavator. The Trick here is to just create barriers as you spray it along. Even if you miss a block or something, you still be successful getting rid of the majority of it, and later you may be able to take out all missed blocks too.
Good luck!
First, you need to be in a hardmode world to do this. Beating your first mechanical boss will allow you to get a steampunker to move in. This is 3x easier with Plantera dead. Then you need to buy the clentaminator. No doubt is it expensive. Well, here's where we start using the money making method. Put lava pits at both ends of your base, and make the lava shallow enough where you can still get hurt, but the drops won't. Test it before you use it. Secure your base so you don't die.
Next, we need to get pirate maps. Head over to the ocean, and constantly farm until you have 5 or more, as each solo invasion gets you around 30-40 gold coins. When you have enough, spawn the invasions at night when your npcs are most likely safe, depending on how your base is set up. Now, you just need a bit of patience. Start summon one invasion after another. Your only enemy to deal with will be parrots, which are very weak. Do this until you have 2 platinum coins. Now buy the clentaminator from the steampunker. Now, go farm more pirate invasions. Use your coins to buy as much green solution as you can afford. It's expensive, but using 1 or more platinum coins can take you a long way. Pirate invasions can also get you items like discount cards and gold coins, which can significantly help you buy more solution for less.
Corruption/Crimson/Hallowed grass can spread over 5 block gaps, and other spreadable blocks can spread over 3 block gaps. Keep this in mind when you do the next step: Creating barriers against the crimson/corruption/hallow as you continue to purify your world. For example, purify a large area then create a barrier or extend your base's barrier to slow down or stop it's spreading. First, I recommend spraying the surface. This will keep the surface from threatening you, and the only place where it's possible to come back is from missed blocks or the hardmode strip that spawned. Now if you don't consider it cheating, you can use TEdit to locate any missed blocks. After you have the surface taken care of, use TEdit to find the spots of crimson/corruption/hallow that formed from smashing altars. Locate and destroy these so they don't become a problem later. Now for the hardest part. If you are real serious about stopping the spread, it's time to clentaminate the hardmode strips. Not easy at all, so don't be expecting it to be too fun, even if it's worth it not having crimson/corruption/hallow all the way down your hellavator. The Trick here is to just create barriers as you spray it along. Even if you miss a block or something, you still be successful getting rid of the majority of it, and later you may be able to take out all missed blocks too.
Good luck!
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and the next you come back the area will be hallowed/crimsoned/corrupted again. 
