diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7abbd355d..20db04f3e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ You should also include the user name that made the change.
 - Server: improve syslog performance @syuilo
 - Server: improve note scoring for featured notes @CyberRex0
 - Server: delete outdated notifications regularly to improve db performance @syuilo
+- Server: delete outdated hard-mutes regularly to improve db performance @syuilo
 - Client: use tabler-icons instead of fontawesome to better design @syuilo
 - Client: Add new gabber kick sounds (thanks for noizenecio)
 - Client: Compress non-animated PNG files @saschanaz
diff --git a/packages/backend/src/queue/processors/CleanProcessorService.ts b/packages/backend/src/queue/processors/CleanProcessorService.ts
index 4225cf6d7f..9836065aa7 100644
--- a/packages/backend/src/queue/processors/CleanProcessorService.ts
+++ b/packages/backend/src/queue/processors/CleanProcessorService.ts
@@ -1,10 +1,11 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { In, LessThan, MoreThan } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { NotificationsRepository, UserIpsRepository } from '@/models/index.js';
+import type { MutedNotesRepository, NotificationsRepository, UserIpsRepository } from '@/models/index.js';
 import type { Config } from '@/config.js';
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type Bull from 'bull';
 
@@ -22,7 +23,11 @@ export class CleanProcessorService {
 		@Inject(DI.notificationsRepository)
 		private notificationsRepository: NotificationsRepository,
 
+		@Inject(DI.mutedNotesRepository)
+		private mutedNotesRepository: MutedNotesRepository,
+
 		private queueLoggerService: QueueLoggerService,
+		private idService: IdService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('clean');
 	}
@@ -39,6 +44,11 @@ export class CleanProcessorService {
 			createdAt: LessThan(new Date(Date.now() - (1000 * 60 * 60 * 24 * 90))),
 		});
 
+		this.mutedNotesRepository.delete({
+			id: LessThan(this.idService.genId(new Date(Date.now() - (1000 * 60 * 60 * 24 * 90)))),
+			reason: 'word',
+		});
+
 		this.logger.succ('Cleaned.');
 		done();
 	}