Revelation 22:14-16

14 Blessed (happy and to be envied) are those who cleanse their garments, that they may have the authority and right to [approach] the tree of life and to enter through the gates into the city.

• How does a person cleanse his garments?
• Because if you acknowledge and confess with your lips that Jesus is Lord and in your heart believe (adhere to, trust in, and rely on the truth) that God raised Him from the dead, you will be saved. For with the heart a person believes (adheres to, trusts in, and relies on Christ) and so is justified (declared righteous, acceptable to God), and with the mouth he confesses (declares openly and speaks out freely his faith) and confirms [his] salvation. Romans 10:9-10
• Now think of what will happen on Judgment Day. Everyone will be there. We will be there, transformed a thousand years earlier to be just like Jesus. The living who did not follow satan when he was released from the Abyss will be there. The dead who will be raised from Hades will also be there. 
• For it is written, As I live, says the Lord, every knee shall bow to Me, and every tongue shall confess to God [acknowledge Him to His honor and to His praise]. Romans 14:11
• For it is written, As I live, says the Lord, every knee shall bow to Me, and every tongue shall confess to God [acknowledge Him to His honor and to His praise]. Philippians 2:10
• A person washes their garments by confessing Jesus as Lord and on Judgment Day everyone will have washed garments, because everyone will confess the Truth that will set them free.
• Our Father will get His way, everyone will be saved and come to the knowledge of the Truth.
• Who wishes all men to be saved and [increasingly] to perceive and recognize and discern and know precisely and correctly the [divine] Truth. 1 Timothy 2:4
• Declaring the end and the result from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all My pleasure and purpose, Isaiah 46:10

15 [But] without are the dogs and those who practice sorceries (magic arts) and impurity [the lewd, adulterers] and the murderers and idolaters and everyone who loves and deals in falsehood (untruth, error, deception, cheating).

• All evil will be done away with on Judgment Day.
• God will wipe away every tear from their eyes; and death shall be no more, neither shall there be anguish (sorrow and mourning) nor grief nor pain any more, for the old conditions and the former order of things have passed away. And He Who is seated on the throne said, See! I make all things new. Also He said, Record this, for these sayings are faithful (accurate, incorruptible, and trustworthy) and true (genuine). And He [further] said to me, It is done! I am the Alpha and the Omega, the Beginning and the End. To the thirsty I [Myself] will give water without price from the fountain (springs) of the water of Life. Revelation 21:4-6
• Death and Hades will be destroyed, Revelation 20:14. Satan will be thrown into the Lake of Fire and destroyed, Revelation 20:10. 
• All of the chaff, or bad stuff, of mankind will be removed from us and will thrown into the Lake of Fire on Judgment Day,  Matthew 3:12
• So yes everything evil will be gone, the people will not be gone, just what made them evil.
• But if any person’s work is burned up [under the test], he will suffer the loss [of it all, losing his reward], though he himself will be saved, but only as [one who has passed] through fire. 1 Corinthians 3:15

16 I, Jesus, have sent My messenger (angel) to you to witness and to give you assurance of these things for the churches (assemblies). I am the Root (the Source) and the Offspring of David, the radiant and brilliant Morning Star.