Already you are CLEAN because of the word that I have spoken to you. How?

[tonychanyt]

After the Last Supper, Jesus spoke in John 15:

1 “I am the true vine, and my Father is the gardener. 2 He cuts off every branch in me that bears no fruit, while every branch that does bear fruit he prunes

καθαίρει (kathairei)
Strong's 2508: To cleanse, purify, prune. From katharos; to cleanse, i.e. to prune; figuratively, to expiate.

so that it will be even more fruitful. 3 You are already clean because of the word that I have spoken to you.

καθαροί (katharoi)
Strong's 2513: Clean.

Verse 2 specified 2 steps:

1. God cut off every branch that attached to Jesus that bore no fruit.
2. For the good branches, God pruned/cleaned.

This was about spiritual cleanness, not physical.

The disciples in John 15 had already been cleansed, i.e., they had passed steps 1 and 2, and they were spiritually clean.

How were the disciples already clean because of the word Jesus spoke?

John 6:

63 The Spirit gives life; the flesh counts for nothing. The words I have spoken to you—they are full of the Spirit and life.

Jesus told his disciples that they had been spiritually purified by accepting his teachings and their relationship with him. The Spirit acted on them to change their thinking and behavior. Jesus' teachings had transformative power.